Shimadzu GC-2014, Instruction Manual

Page: 34 / 318

2 Before Use
2.2 Outputting Analog Signals to the Chromatopac
22
GC-2014
“Signal Attenuation” or “Signal Range”
Names of items automatically change according to types of analog signals as listed below.
Set multiplying power (attenuation rate) of output signals for all types. Change the setting
when the peak obtained by the data processing unit is saturated.
Signal attenuation: When analog signal type is wide
Output signal becomes smaller when the setting is changed from x 1
→
x 2 -1
→
x 2 -2
→
x 2
-3
→
x 2
-4
Signal range: When analog signal type is linear
Output signal becomes smaller when the setting is changed from x1
→
x10
-1
→
x10
-2
→
x 10 -3
→
x 10 -4
“Analog Signal Type”
Set a signal type according to the type of Chromatopac to be connected. If this is set
incorrectly, data cannot be processed correctly.
Wide : C-R8A, C-R7A, C-R7Aplus
Linear: Chromatopacs other than C-R8A, C-R7A, C-R7Aplus
■
Calibration of analog wide range signal
When the GC is connected to the Chromatopac (C-R8A, C-R7A, C-R7Aplus) with a
chromatopac signal cable and the “analog signal type” described above is set to “Wide,”
calibration is necessary in order to match the zero level of the GC and Chromatopac.
Perform calibration in the following cases.
• When the GC and Chromatopac are connected for the first time (during installation)
• When the GC or Chromatopac is changed with other instrument.
• When a connection channel number is changed by switching a connector on the GC side
• When a two-channel board is installed on the Chromatopac and a connection channel
number is changed by switching a connector on the Chromatopac side
Calibration is not necessary when a detector is changed (e.g. when signal to be outputted to Ch1 is
changed from TCD to FID).
The following is calibration procedures.
(1) Press the [DET] key on the GC to turn OFF the detector control.
(2) Load the BASIC calibration program.
C-R7A, C-R7Aplus: Type “LOAD “ZCALIB”” on the [Win3] key screen.
C-R8A: Type “LOAD “8.ZCALIB.BAS”” when key input is possible.
(3) Press the [RUN] key of the Chromatopac.
(4) Enter the Chromatopac channel number when the following sentence is displayed.
C-R7A, C-R7Aplus: “Channel No. (1:CH1 2:CH2) : ?”
C-R8A: “CH No. (1:CH1 2:CH2) : ?”
(5) Enter “Y” when the sentence below is displayed to save calibration results on the
Chromatopac. If they are not saved on the disk, calibration is required again when
starting the Chromatopac after turning its power off.
C-R7A, C-R7Aplus: “Save to disk (Y: Yes N: No) : ?”
C-R8A: “Save to the disk (Y: Save N: No) : ?”
(6) Press the [DET] key of the GC to turn ON the detector control.
NOTE